e1000: fix ethtool test irq alloc as "probe"

New code added in 2.6.17 caused setup_irq to print a warning when
running ethtool -t eth0 offline.

This test marks the request_irq call made by this test as a "probe"
to see if the interrupt is shared or not.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

drivers/net/e1000/e1000_ethtool.c

@@ -870,13 +870,16 @@ e1000_intr_test(struct e1000_adapter *adapter, uint64_t *data)
 	*data = 0;
 
 	/* Hook up test interrupt handler just for this test */
- 	if (!request_irq(irq, &e1000_test_intr, 0, netdev->name, netdev)) {
+	if (!request_irq(irq, &e1000_test_intr, SA_PROBEIRQ, netdev->name,
+	                 netdev)) {
  		shared_int = FALSE;
  	} else if (request_irq(irq, &e1000_test_intr, SA_SHIRQ,
 			      netdev->name, netdev)){
 		*data = 1;
 		return -1;
 	}
+	DPRINTK(PROBE,INFO, "testing %s interrupt\n",
+	        (shared_int ? "shared" : "unshared"));
 
 	/* Disable all the interrupts */
 	E1000_WRITE_REG(&adapter->hw, IMC, 0xFFFFFFFF);